feat(agent): add rpc status command and tests; rpc only path

apps/macos/Tests/ClawdisIPCTests/AgentRPCTests.swift

@@ -0,0 +1,17 @@
+import Clawdis
+import Testing
+@testable import ClawdisIPC
+
+@Suite(.serialized) struct AgentRPCTests {
+    @Test func statusFailsWhenProcessMissing() async {
+        let result = await AgentRPC.shared.status()
+        // We don't assert ok because the worker may not be available in CI.
+        // Instead, ensure the call returns without throwing and provides a message.
+        #expect(result.ok == true || result.error != nil)
+    }
+
+    @Test func rejectEmptyMessage() async {
+        let result = await AgentRPC.shared.send(text: "", thinking: nil, session: "main")
+        #expect(result.ok == false)
+    }
+}